CN106525301A - Force and displacement measurement method and sensor based on distributed optical fiber sensing - Google Patents
Force and displacement measurement method and sensor based on distributed optical fiber sensing Download PDFInfo
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- CN106525301A CN106525301A CN201611196028.2A CN201611196028A CN106525301A CN 106525301 A CN106525301 A CN 106525301A CN 201611196028 A CN201611196028 A CN 201611196028A CN 106525301 A CN106525301 A CN 106525301A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 69
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 61
- 238000000691 measurement method Methods 0.000 title abstract description 6
- 239000000835 fiber Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 230000008054 signal transmission Effects 0.000 claims abstract description 16
- 238000011068 loading method Methods 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 6
- 239000003822 epoxy resin Substances 0.000 claims abstract description 5
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 5
- 238000009499 grossing Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- 230000004927 fusion Effects 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims description 2
- 238000012417 linear regression Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 13
- 229910052751 metal Inorganic materials 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003292 glue Substances 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/247—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet using distributed sensing elements, e.g. microcapsules
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
Abstract
The invention discloses a force and displacement measurement method and sensor based on distributed optical fiber sensing. A distributed strain sensing fiber is pasted to the side wall of a thin wall metal ring in a circle by using epoxy resin glue along a full length. Fiber demodulation equipment and the distributed strain sensing fiber pasted to the side wall of the thin wall metal ring are connected in series through a signal transmission fiber and are connected to a computer through a serial port and a network cable. After applying force to the vertex of the thin wall metal ring or the displacement of the thin wall metal ring, the fiber demodulation equipment and the computer are used to collect and record the circumferential strain distribution of the thin wall metal ring under a loading effect. A moving average method is used to carry out smooth processing on strain monitoring data, the fitting is carried out when the strain data is in accordance with a trigonometric function so as to calculate the maximum circumferential strain value of the thin wall metal ring, and thus the force and displacement are calculated. Through a calibration test, the strain value, the action force of the vertex of the thin wall metal ring, and a corresponding displacement linear relationship are obtained, and the calibration coefficient of the sensor is obtained on the above basis.
Description
Technical field
A kind of the invention belongs to fiber optic sensor technology field, more particularly to power and displacement based on distributed fibre optic sensing
Measuring method and sensor.
Background technology
Thin-wall metal circular ring is widely used in traditional earthwork test Instrument as force transducer, such as non-confining strength
Degree tester, triaxial apparatus, direct shear apparatus etc..These instruments be by dial gauge, amesdial read deformation of the annulus under load come
Realize the measurement of power.But in most cases, this method certainty of measurement is relatively low, and range ability is less, and need regularly to mark
It is fixed.Still an alternative is that foil gauge is attached on metal ring with adhesive constituting resistance bridge, then strain is caused
Resistance variations be converted into voltage signal.The defect of the method is that test reading is forbidden by electromagnetic interference, reading easily.Due to power and
The Measurement reliability of displacement is poor, seriously hinders the development of earthwork test Instrument.
In recent years, Distributed Optical Fiber Sensing Techniques have obtained the development advanced by leaps and bounds.The technology can be with Quick Acquisition to light
The optical signal of fine optional position, and optical fiber is obtained along the strain of all positions of total length, temperature etc. with reference to related transducer principle
Physical parameter, realizes the distributed monitoring that routine monitoring technology is difficult to.In addition the technology have data volume it is big, without electromagnetism
Interference, it is full-automatic, can remote monitoring the features such as.Just because of these advantages, distributed optical fiber sensing technology is by more and more
It is applied in all kinds of engineering structure monitorings and laboratory test.
Brillouin optical time domain analysis (BOTDA), Brillouin light Time Domain Reflectometry (BOTDR) distributed optical fiber sensing technology
Principle is using between the Brillouin scattering frequency variation (frequency shift amount) in optical fiber and optical fiber axial direction strain or ambient temperature
Linear relationship realizing sensing, the relation can be expressed as：
In formula：νB(ε,T)、νB(ε0,T0) it is respectively the frequency shift amount for measuring Brillouin scattering in forward and backward optical fiber；ε、ε0Point
Axial strain before and after Wei not testing；T、T0Temperature value before and after respectively testing.Proportionality coefficientWith's
Value is respectively 0.05MHz/ μ ε and 1.2MHz/ DEG C.
The content of the invention
It is an object of the present invention to provide a kind of power and displacement measurement method and sensor based on distributed fibre optic sensing,
So that power, displacement data measured by soil test are more accurate, reliable, and automatic measurement is realized, so as to thoroughly solve
Existing earthwork test Instrument is low to power, displacement measurement accuracy, by defects such as electromagnetic interference.
For solving the above problems, the present invention is employed the following technical solutions：It is a kind of to be based on distributed fibre optic sensing power and displacement
Measuring method, comprise the steps：
Step one, one thin wall circular of offer, paste distributed strain sensing optical fiber on the side wall of the thin wall circular, use
Signal transmission fiber is connected to optical fiber demodulating apparatus；
Step 2, in the thin wall circular apex applying power or displacement, make to paste the distribution on thin-wall circular ring-side wall
There is strain in formula straining and sensing optical fiber, with optical fiber demodulating apparatus and computer acquisition, record the hoop strain of the thin wall circular
Distribution measured value；
Step 3, using moving average method to strain Monitoring Data be smoothed, the strain data after smoothing processing
Meet trigonometric function feature, be fitted in the form of cosine function ε (x)=a cos [b (x-c)]+d, in formula：Parameter a represents plan
The maximum ring strain value that conjunction is obtained；Parameter b is to eliminate function cycle error；Parameter c is to eliminate present in loading partially
Heart error；Parameter d is to eliminate the error that temperature change is brought；X represents the distance away from thin wall circular bottom；ε (x) represents thin-walled
Hoop strain value of the annulus under a constant load, displacement；Draw thin wall circular under a constant load, displacement according to fit equation
Maximum ring strain value | ε |max；
Step 4, derived by theoretical formula and learnt, the active force of thin wall circular apex and displacement are with thin wall circular most
There is linear relationship, i.e. F=K in big hoop strain value1×|ε|maxWith Δ D=K2×|ε|max, in formula：F is represented and is acted on thin-walled
Power on annulus；Δ D represents the displacement that thin wall circular apex occurs；K1、K2Respectively constant, is determined by rating test；By
Above formula calculates the power corresponding to certain maximum hoop strain measured value and displacement.
Rating test described in step 4, comprises the steps：First, distributed strain sensing optical fiber has been pasted
Thin wall circular is placed on loading bench, is classified active force and the displacement for applying known dimensions in thin wall circular apex, is made thin-walled
There is hoop strain in annulus, record the hoop strain measured value of thin wall circular under loads at different levels；Secondly, hoop strain measured value is carried out
Smoothing processing and fitting, obtain the maximum ring strain value of thin wall circular under loads at different levels accordingly；Finally, set up thin wall circular most
Big linear relationship between hoop strain value and active force, displacement, i.e. F=K1×|ε|maxWith Δ D=K2×|ε|max, using line
Property homing method calculates calibration coefficient K1、K2Size.
A kind of sensor device in the described measuring method based on distributed fibre optic sensing power and displacement, mainly
Including distributed strain sensing optical fiber, thin wall circular, signal transmission fiber, optical fiber demodulating apparatus and computer；Distributed strain
Sensing optical fiber is serially connected with optical fiber demodulating apparatus by signal transmission fiber, computer and optical fiber demodulating apparatus using serial ports,
Netting twine connects；Described distributed strain sensing optical fiber is pasted on thin-wall circular ring-side wall.
The thin wall circular is made using the metal material with linear elasticity strain-stress relation.
Whole distributed strain sensing optical fiber is tightly pasted on the side wall of thin wall circular along total length epoxy resin, is made
Which is pasted firmly with annulus.
Mutual welding between the distributed strain sensing optical fiber and signal transmission fiber, and welding is protected with heat-shrinkable T bush
Point.
Beneficial effect：
(1) according to mechanical analyses, exist between thin wall circular apex active force and displacement and maximum hoop strain preferable
Linear relationship, be derived from calibration coefficient K1And K2；
(2) a kind of power and displacement measurement method based on distributed fibre optic sensing is proposed, is realized to thin wall circular deformation
In high precision, automatically, distributed testing, overcomes the problems such as traditional method efficiency is low, error is big, Monitoring Data amount is little；
(3) install using the present invention that simple, measurement is accurate, high degree of automation, cost performance are good.
Description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the biosensor assay schematic device of distribution type fiber-optic dynamometry and displacement in embodiment；Wherein, 1 is distribution
Formula straining and sensing optical fiber, 2 is thin wall circular, 3 signal transmission fibers, and 4 is computer, and 5 is optical fiber demodulating apparatus, and 6 is omnipotent examination
Test machine.
Fig. 3 is fibre strain reading and fitted figure in the embodiment of the present invention；
Fig. 4-5 is the comparison between Theoretical Calculation and actually measured value in the embodiment of the present invention；
Specific embodiment
Technical scheme is more specifically described below in conjunction with drawings and Examples.
A kind of distribution type fiber-optic force cell, including distributed strain sensing optical fiber, thin wall circular, signal light transmission
Fine, optical fiber demodulating apparatus and computer.Optical fiber demodulating apparatus with paste the distribution on thin-wall circular ring-side wall (inwall or outer wall)
Formula straining and sensing optical fiber is serially connected by signal transmission fiber, and computer and optical fiber demodulating apparatus are connected using serial ports, netting twine.
Used as the further optimization of such scheme, the thin wall circular is using the gold with linear elasticity strain-stress relation
Category material is made, such as rustless steel, aluminium alloy etc..
As the further optimization of such scheme, in order to there is concordance in the deformation for ensureing optical fiber and metal ring, will be whole
Root distributed strain sensing optical fiber is tightly pasted on the thin-wall circular ring-side wall along total length epoxy resin, is placed in interior
24h so as to paste firmly with annulus.As optical fiber is soft, the mode that only total length is pasted just can guarantee that optical fiber and thin-walled
Circle ring-side wall is uniformly close to, and the mode such as pastes using colligation, fixed point and can cause measurement error.
As the further optimization of such scheme, between the distributed strain sensing optical fiber and signal transmission fiber mutually
Welding, and fusion point is protected with heat-shrinkable T bush.
In such scheme, in the thin wall circular apex applying power or displacement, make to paste on thin-wall circular ring-side wall
Distributed strain sensing optical fiber there is strain, with optical fiber demodulating apparatus and computer acquisition, record the ring of the thin wall circular
To strain value；
Further, it is smoothed to straining Monitoring Data using moving average method, the dependent variable after smoothing processing
According to trigonometric function feature is met, it is fitted in the form of cosine function ε (x)=a cos [b (x-c)]+d, in formula：Parameter a=| ε
|maxThe maximum ring strain value that fitting is obtained is represented, to eliminate function cycle error, parameter c is to eliminate in loading for parameter b
The eccentric error of presence, parameter d represent the distance away from thin wall circular bottom to eliminate the error that temperature change is brought, x,；ε
X () represents hoop strain value of the thin wall circular under a constant load, displacement.On the one hand can be reflected very well using the fitting function
The strain curve feature of thin wall circular, still further aspect are can to eliminate various errors in test due to the fit approach, are improved
Measuring accuracy.Maximum ring strain value | the ε | of thin wall circular under a constant load, displacement is drawn according to fit equationmax；
Further, according to F=K1×|ε|maxWith Δ D=K2×|ε|max, thin wall circular is obtained by maximum ring strain value
The amount of force of apex and corresponding displacement, in formula：F represents the power acted in thin wall circular；Δ D represents thin wall circular
The displacement that apex occurs；K1、K2Respectively constant, is determined by rating test.In such scheme, pushed away by theoretical formula
Lead and learn, the active force of thin wall circular apex and displacement have above-mentioned linear pass with thin wall circular maximum ring strain value
System.
Further, in order to obtain calibration coefficient K1、K2, the thin wall circular for having pasted distributed strain sensing optical fiber is put
Put on loading bench, distributed strain sensing optical fiber is connected to into optical fiber demodulating apparatus with signal transmission fiber, optical fibre interrogation sets
Standby connection computer；Apply the active force of known dimensions and displacement in thin wall circular apex, make to paste in thin-wall circular ring-side wall
On distributed strain sensing optical fiber there is strain, with optical fiber demodulating apparatus, computer acquisition, record the ring of the thin wall circular
To strain measured value；Strain data is smoothed using moving average method, and is fitted using cosine function.According to plan
Close equation and draw maximum ring strain value of the thin wall circular under a constant load；By changing the effect being applied in thin wall circular
Power and displacement, obtain maximum ring strain value of the thin wall circular under different active forces, displacement.According to formula F=K1×|ε|max
With Δ D=K2×|ε|maxCalculate calibration coefficient K1、K2Size.
The principle of the invention：Annulus is measured using the distributed strain sensing optical fiber pasted in thin wall circular to use in outer masterpiece
The hoop strain of lower generation；The strain value of distributed strain sensing optical fiber is collected by optical fiber demodulating apparatus and computer；To receiving
The strain data for collecting carries out smooth and process of fitting treatment, obtains the maximum ring strain value of thin wall circular；According to thin wall circular top
Linear relationship at point between active force and corresponding displacement and maximum ring strain value is calculated exerts oneself and displacement.
Embodiment 1
Such as Fig. 2, a kind of distribution type fiber-optic dynamometry and displacement transducer, including distributed strain sensing optical fiber 1, thin wall circular
2nd, signal transmission fiber 3, computer 4, optical fiber demodulating apparatus 5, universal testing machine 6.In order to ensure optical fiber and gold in methods described
There is concordance in the deformation of category annulus, distributed strain sensing optical fiber 1 is pasted in thin wall circular 2 with glue such as epoxy resin
Outer wall, is placed in indoor 24h so as to paste firmly with 2 surface of thin wall circular.The optical fiber demodulating apparatus 5 with paste in thin-walled
The distributed strain sensing optical fiber 1 of 2 side wall of annulus is serially connected by signal transmission fiber 3.The distributed strain senses light
The mutual weld of fibre 1 and signal transmission fiber 3 is cased with heat-shrinkable T bush protection.The reading of the distributed strain sensing optical fiber 1
By 4 automatic data collection of optical fiber demodulating apparatus 5 and computer.Optical fiber employed in embodiment is the single mode list of a diameter of 0.9mm
Core tightly packaged fiber.
Described device is loaded using at the uniform velocity displacement load mode on universal testing machine 6, aobvious on universal testing machine 6
Show the strength and the displacement relation curve in instrument record loading procedure, the measured value be used for verifying the active force that fibre strain extrapolates,
The accuracy of displacement.
When 2 apex of thin wall circular is acted on by power, the distributed sensing fiber on 2 side wall of thin wall circular is pasted
1 there is strain, and the strain will set will the Brillouin scattering frequency shifts on distributed strain sensing optical fiber, optical fibre interrogation
It is standby to measure the frequency shift amount in real time, so as to obtain the hoop strain distribution situation of metal ring.In order to eliminate measurement error, adopt
With moving average method to being smoothed to measured strain data.
Assume thin wall circular occurs under radial forces ellipticity deform, then in thin wall circular each point radial displacement
For：
In formula：Y is the radial displacement of each point in thin wall circular；For azimuth；Δ D is diameter change amount.According further to power
, in thin wall circular, between the radial displacement of each point and moment of flexure, there is following relation in theory：
In formula：For thin wall circular institute bending moment；Elastic modelling quantity of the E for thin wall circular；Inertia of the I for thin wall circular
Square；Radiuses of the R for thin wall circular.Obtained by above formula：In formula：D is straight for thin wall circular
Footpath.WhenWhen, the maximum hoop strain of thin wall circular isIn formula：D for thin wall circular thickness one
Half.The formula is rewritable to beIn formula：K2For the calibration coefficient of displacement, rating test can be passed through
Obtain.
According to the thin wall circular Stress calculation formula of Timoshenko in Elasticity, certain radial force effect can be obtained
The formula of the inside and outside wall hoop strain ε of lower thin wall circular
In formula：Thickness of the ω for thin wall circular；Width of the δ for thin wall circular；F is suffered by unit thickness in thin wall circular
The contrary radial forces of both direction；θ is azimuth；RaFor the central diameter of metal ring；Elastic modelling quantity of the E for thin wall circular.
When θ=90 °, the absolute value of thin-wall circular hoop strain reaches maximum, andIt is further converted intoIn formula：K1For the calibration coefficient of power, can be obtained by rating test.
The embodiment of rating test includes：Rightabout radial effect is applied to metal ring using charger
Power, etc. the hoop strain reading for recording thin wall circular after stable reading, then multistage loadings, record strain data successively.
Measured reading strain moving average method is smoothed to data, the thin-wall circular obtained by smoothing processing
Ring hoop strain reading carries out the form fitting of cosine function ε (x)=a cos [b (x-c)]+d, in formula：Parameter a=| ε |maxTable
Show the maximum ring strain value that fitting is obtained, parameter b is present to eliminate in loading to eliminate function cycle error, parameter c
Eccentric error, parameter d is to eliminate the error that temperature change is brought.Show that thin wall circular is corresponding under every grade of load accordingly
Maximum ring strain value | ε |max。
The size of active force and displacement is drawn according to theoretical formula method, the display instrument reading that last and charger is carried
Contrasted.And draw the relation curve of Theoretical Calculation active force and displacement and actual measured value.As shown in Figures 4 and 5, from figure
It can be seen that the result of calculation and actual measured value of power and displacement measurement method based on distributed fibre optic sensing are closely.
There is relation F=K between the active force of thin wall circular apex and displacement and maximum hoop strain1×|ε|max
With Δ D=K2×|ε|max, the result obtained according to above step calculates calibration coefficient K1And K2Size.The calibration coefficient can
Using the design parameter as sensor.
It should be noted that in addition to the implementation, the present invention can also have other embodiment.All employing equivalents
Or the technical scheme that equivalent transformation is formed, all fall within the protection domain of patent requirements of the present invention.
Claims (6)
1. it is a kind of based on distributed fibre optic sensing power and the measuring method of displacement, it is characterised in that to comprise the steps：
Step one, one thin wall circular of offer, on the side wall of the thin wall circular paste distributed strain sensing optical fiber, use signal
Transmission Fibers are connected to optical fiber demodulating apparatus；
Step 2, in the thin wall circular apex applying power or displacement, make to paste on thin-wall circular ring-side wall it is distributed should
Become sensing optical fiber occur strain, with optical fiber demodulating apparatus and computer acquisition, record the thin wall circular hoop strain distribution
Measured value；
Step 3, using moving average method to strain Monitoring Data be smoothed, the strain data after smoothing processing meets
Trigonometric function feature, is fitted in the form of cosine function ε (x)=acos [b (x-c)]+d, in formula：Parameter a is represented and is fitted
The maximum ring strain value for arriving；Parameter b is to eliminate function cycle error；Parameter c is to eliminate eccentric present in loading mistake
Difference；Parameter d is to eliminate the error that temperature change is brought；X represents the distance away from thin wall circular bottom；ε (x) represents thin wall circular
Hoop strain value under a constant load, displacement；Maximum of the thin wall circular under a constant load, displacement is drawn according to fit equation
Hoop strain value | ε |max；
Step 4, derived by theoretical formula and learnt, the active force of thin wall circular apex and displacement and thin wall circular maximum loop
There is linear relationship, i.e. F=K to strain value1×|ε|maxWith Δ D=K2×|ε|max, in formula：F is represented and is acted on thin wall circular
On power；Δ D represents the displacement that thin wall circular apex occurs；K1、K2Respectively constant, is determined by rating test；By the above
Formula calculates the power corresponding to certain maximum hoop strain measured value and displacement.
2. according to claim 1 a kind of based on distributed fibre optic sensing power and the measuring method of displacement, it is characterised in that
Rating test described in step 4, comprises the steps：First, the thin wall circular of distributed strain sensing optical fiber has been pasted
It is placed on loading bench, is classified active force and the displacement for applying known dimensions in thin wall circular apex, occurs thin wall circular
Hoop strain, records the hoop strain measured value of thin wall circular under loads at different levels；Secondly, hoop strain measured value is smoothed
And fitting, the maximum ring strain value of thin wall circular under loads at different levels is obtained accordingly；Finally, setting up thin wall circular maximum ring should
Linear relationship between variate and active force, displacement, i.e. F=K1×|ε|maxWith Δ D=K2×|ε|max, using linear regression side
Method calculates calibration coefficient K1、K2Size.
3. the sensing in a kind of measuring method based on distributed fibre optic sensing power and displacement for described in claim 1 or 2
Device device, it is characterised in that mainly include that distributed strain sensing optical fiber, thin wall circular, signal transmission fiber, optical fibre interrogation set
Standby and computer；Distributed strain sensing optical fiber is serially connected with optical fiber demodulating apparatus by signal transmission fiber, computer and
Optical fiber demodulating apparatus are connected using serial ports, netting twine；Described distributed strain sensing optical fiber is pasted on thin-wall circular ring-side wall.
4. the sensor in the measuring method for based on distributed fibre optic sensing power and displacement according to claim 3 is filled
Put, it is characterised in that the thin wall circular is made using the metal material with linear elasticity strain-stress relation.
5. the sensor in the measuring method for based on distributed fibre optic sensing power and displacement according to claim 3 is filled
Put, it is characterised in that whole distributed strain sensing optical fiber is tightly pasted in the side of thin wall circular along total length epoxy resin
On wall so as to paste firmly with annulus.
6. the sensor in the measuring method for based on distributed fibre optic sensing power and displacement according to claim 3 is filled
Put, it is characterised in that mutual welding between the distributed strain sensing optical fiber and signal transmission fiber, and protected with heat-shrinkable T bush
Shield fusion point.
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| CN108169023A (en) * | 2018-03-23 | 2018-06-15 | 西南交通大学 | A kind of experimental rig and test method for measuring the deformation of cylinder test specimen circumferential direction super large |
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| CN109974914A (en) * | 2019-04-17 | 2019-07-05 | 福州大学 | A kind of Mume flower contact distributed contact resistor pressure detection method and device |
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